Flmprovement in grates



J. A. LAWSON.

GRATE.

Paenea'm'y 2.187'6.

N. PEIiRS. PHOTO-L THOGRA PH jl Toall whom ttgmayconcm which-`umnnsn:(fLAwsoN,f:orfrnor, NEw YORK.

Specification forming part of vLetters Patent No. 1765971, dated May 2,1876; lapplication filed- 4 Febrnary', 187 6.

Be it knownthat I,`JA1uEs ALte/son, of

V``Troy, in'thecountyof Rensselaer and intle State of N ew' York, haveinventedcertain new anduseful Improvements in Grates for Stores; anddohereby declare that the'follou'ing is a full, clear, and exact'description thereof, ret. ere'nce being had to the accompanyingdrawings, making apart of thisfspecification, in

Figure l is a perspective View of the -main e j or1 supporting ggrate,supplenental grate, and i i grate-t'rame,,as combined for use. i``l`igs'.4 2, 3, and 4 arelike views 'offs'aid parts separated from eachother; land Fig. his a perspective view of the engaging portions 'ofthe'detachai ble handle and snpplenental'grate.

'Letters' 4of. like name and kind refer to like partsi each'of thefigures. i

The design of my inve'ntion'is to increase theefticiencyofstoive-grates, and render more easy the removal of ashes and clinker; towhich i end it consists, principally, in; tvhecon'struction of thegrate-frame, by mean'sflofj which a horizontally-revolving `vmain grateand a' horizontally-sliding supplemental grate are supported in positionfor operation, substautially as is hereinafter speeified.

It consists, further, in a circular grate con- `structed with an opencenter, and having a vibratory motion around its axis', in combinationwith a lower supplemental grate, which' slides horizontally upon orwithin' parallelways that are attached to or 'upon part of thesupporting-frame of said uppergrate, substantially as and lfor thepurpose hereinafter shown.

It consists, further, in the peculiar-construction ofthe handle or barfor operating the supplementalgrate,and its combination with' the same,substantially as and for the purpose hereiafter set forth. l

It consists, finally, in the neans employed for supporting in positionthe operating-bar `of the supplemental gratewlen the ash-pit door isopened, substantially as is hereinafter shown and described. 4

In the annexeddrawings, A represents the main portion of the frame of mygrate, which part is formed upon a circular line, and has secured to itslowerI side two straight bars, AI

'in a line'passing from front to rear. distant'points wit-hi the'circular portion A and A', tlat arearranged in parallel l ies,-and

extend vfroV the rear inner edge of said part A forwardto a pointconside'ably in advance of itsfront outer edge. v Between the bars AIand AI the front portion of the cirenla portion'A of the' frame isremoved, and within the inner upper side of each bar is formed aright-angled rabbet, a, that receives one edge ot' a grate, B, and inconnection' ``with the -opposite rabbet forms bearings for and withinwhich said grate may be moved horizontally At equiof the grate-frane arejournaled three rollers,

a' and a', each of which revolves upon an axis that is horizontal, andplaced inline radially? with the a`xial center of said portion A, and

upon said rollers is placed a grate, O, that'has aannular form in planview, and is serrated around itsl inner edge, the arrangement being 4such as to enable' said grate to be rotatedin a horizontal plane aroundits axial center.

`As thus coustructed and combined it willv be seen that when the grates'Band O occupy their normall position.,'thej former is directly beneaththe central opening c. in the latter,

and operates as a supplemental grate to' close said opening and preventthe downward passage of coal or cinders from above, without, irr

any manner, restricting saidupper grate O in its motion around its axis.

When it is desired to remove slate or cinders from thecombustionehamber, the lower i or snpplemental grate rB may be rdrawnpartially or entirely out from beneath the central opening c ofthe uppergrate O, and through said opening said refuse will fall into the ashpit.Ordinarily, the, agitation of the main grate O will be sufficient toclean the fire, but,

to removel pieces of slate or other refuse too large to pass through theinterstices of the lsame and the lower grate, the operation abovedescribed is necessary.

Theup'per grate G is agitated by means of a shaker-bar of usual form,which is intro- (lucedthrough a suitable opening in the door ofthestove, and has its inner end contained within a socket, c', that isprovided at the front edgel of said grate. The lower orsuppl'ementalgrate B is operated by a bar, D,

`which extends forward through a correspond- I detached therefrom, to'accomplish which object the following-described construction is had: Theinner end ofthe bar D is made semicireular in plan View, and upon itslower side isprovided a pin, d, which extends vertically downwardrandhas upon one side, near its lower en'd, a feather, d', whichextends'rearward and to one side upon a radial line. Within the forwardend, at the transverse center 'of the grate B, is a semicircular boss,b,

which contains a central opening, b', that corresponds i n sizeand'shape to the pin d, and at its rear side has a recess, b, for thepassage of the feather d'. The upper side of the boss b is counterbored,as shown, for the reception of the senicircular end of the shaker-bar,while the lower side of the latter is, in'like manner, counterbored toreceive the round forward end of said boss, the arrangement describedafi'ording suflicient end bearing' to entirely relieve the pin d fromwear. I

As thus constructed, the shaker-bar may be placedV in or removed fromengagement by turning its forward end to one side until the feather d'coincides with the recess b. When in place said bar is firmly locked bythe feather, and prevented from accidental displacement. The'position ofthe feather is such as to cause it to coincide with its recess when thebar ismovedoutward from the open side of the lug E. v

Having thus fully set forth the nature and merits of my invention, whatI claim as new 1. In combination with the horizontally-slidingsupplemental grate B and the rotatin g main grate O, thesupporting-frame composed of. the circlar .portion A, and parallel barsAI and A', provided each with a rabbet,ra, substantially as and forthe-purpose specified.

2. In combination with ciroular main grate U rovided with an o en centerc and ar- 7 P i a `ranged to vibrate around its axis, the supplementalgrate B, placed below said main grate, and .arranged to slidehorizontally upon or within the parallel ways A' and A', which areattached to and form part of the 'supportingframe A of said main grate,substantially as and for the purpose shown, i

3. In combination with Vthe supplementall grate B, provided with-the.semicircular boss b, opening b', and recess b", the shaker-bar l),having the pin d and feather'd', substantially as and for the purposeset forth.

4. In combination with the longi'tudinallyreciprocating slaker-bar,capable of having its forward end moved laterally, the rightangled lug`E, secured upon the lower side of the base-plate of the stove, -andfurnishing a support for said bar, substantially as'is shown anddescribed. i

In testimony that I claimi'the foregoing I have hereunto set my handthis 21st day of January, 1876.

JAMES A. LAWsoN.

Witnesses: v

LEWIs L. FosDoK, J onN B. FosDoK.

